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audk/MdeModulePkg/Universal/EbcDxe/EbcInt.c

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/** @file
Top level module for the EBC virtual machine implementation.
Provides auxiliary support routines for the VM. That is, routines
that are not particularly related to VM execution of EBC instructions.
Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "EbcInt.h"
#include "EbcExecute.h"
#include "EbcDebuggerHook.h"
//
// We'll keep track of all thunks we create in a linked list. Each
// thunk is tied to an image handle, so we have a linked list of
// image handles, with each having a linked list of thunks allocated
// to that image handle.
//
typedef struct _EBC_THUNK_LIST EBC_THUNK_LIST;
struct _EBC_THUNK_LIST {
VOID *ThunkBuffer;
EBC_THUNK_LIST *Next;
};
typedef struct _EBC_IMAGE_LIST EBC_IMAGE_LIST;
struct _EBC_IMAGE_LIST {
EBC_IMAGE_LIST *Next;
EFI_HANDLE ImageHandle;
EBC_THUNK_LIST *ThunkList;
};
/**
This routine is called by the core when an image is being unloaded from
memory. Basically we now have the opportunity to do any necessary cleanup.
Typically this will include freeing any memory allocated for thunk-creation.
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param ImageHandle Handle of image for which the thunk is being
created.
@retval EFI_INVALID_PARAMETER The ImageHandle passed in was not found in the
internal list of EBC image handles.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcUnloadImage (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle
);
/**
This is the top-level routine plugged into the EBC protocol. Since thunks
are very processor-specific, from here we dispatch directly to the very
processor-specific routine EbcCreateThunks().
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param ImageHandle Handle of image for which the thunk is being
created. The EBC interpreter may use this to
keep track of any resource allocations
performed in loading and executing the image.
@param EbcEntryPoint Address of the actual EBC entry point or
protocol service the thunk should call.
@param Thunk Returned pointer to a thunk created.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Image entry point is not 2-byte aligned.
@retval EFI_OUT_OF_RESOURCES Memory could not be allocated for the thunk.
**/
EFI_STATUS
EFIAPI
EbcCreateThunk (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle,
IN VOID *EbcEntryPoint,
OUT VOID **Thunk
);
/**
Called to get the version of the interpreter.
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param Version Pointer to where to store the returned version
of the interpreter.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Version pointer is NULL.
**/
EFI_STATUS
EFIAPI
EbcGetVersion (
IN EFI_EBC_PROTOCOL *This,
IN OUT UINT64 *Version
);
/**
To install default Callback function for the VM interpreter.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@retval EFI_SUCCESS The function completed successfully.
@retval Others Some error occurs when creating periodic event.
**/
EFI_STATUS
EFIAPI
InitializeEbcCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This
);
/**
The default Exception Callback for the VM interpreter.
In this function, we report status code, and print debug information
about EBC_CONTEXT, then dead loop.
@param InterruptType Interrupt type.
@param SystemContext EBC system context.
**/
VOID
EFIAPI
CommonEbcExceptionHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_SYSTEM_CONTEXT SystemContext
);
/**
The periodic callback function for EBC VM interpreter, which is used
to support the EFI debug support protocol.
@param Event The Periodic Callback Event.
@param Context It should be the address of VM_CONTEXT pointer.
**/
VOID
EFIAPI
EbcPeriodicNotifyFunction (
IN EFI_EVENT Event,
IN VOID *Context
);
/**
The VM interpreter calls this function on a periodic basis to support
the EFI debug support protocol.
@param VmPtr Pointer to a VM context for passing info to the
debugger.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcDebugPeriodic (
IN VM_CONTEXT *VmPtr
);
//
// These two functions and the GUID are used to produce an EBC test protocol.
// This functionality is definitely not required for execution.
//
/**
Produces an EBC VM test protocol that can be used for regression tests.
@param IHandle Handle on which to install the protocol.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
InitEbcVmTestProtocol (
IN EFI_HANDLE *IHandle
);
/**
Returns the EFI_UNSUPPORTED Status.
@return EFI_UNSUPPORTED This function always return EFI_UNSUPPORTED status.
**/
EFI_STATUS
EFIAPI
EbcVmTestUnsupported (
VOID
);
/**
Registers a callback function that the EBC interpreter calls to flush the
processor instruction cache following creation of thunks.
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param Flush Pointer to a function of type EBC_ICACH_FLUSH.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcRegisterICacheFlush (
IN EFI_EBC_PROTOCOL *This,
IN EBC_ICACHE_FLUSH Flush
);
/**
This EBC debugger protocol service is called by the debug agent
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param MaxProcessorIndex Pointer to a caller-allocated UINTN in which the
maximum supported processor index is returned.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcDebugGetMaximumProcessorIndex (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
OUT UINTN *MaxProcessorIndex
);
/**
This protocol service is called by the debug agent to register a function
for us to call on a periodic basis.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param ProcessorIndex Specifies which processor the callback function
applies to.
@param PeriodicCallback A pointer to a function of type
PERIODIC_CALLBACK that is the main periodic
entry point of the debug agent. It receives as a
parameter a pointer to the full context of the
interrupted execution thread.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ALREADY_STARTED Non-NULL PeriodicCallback parameter when a
callback function was previously registered.
@retval EFI_INVALID_PARAMETER Null PeriodicCallback parameter when no
callback function was previously registered.
**/
EFI_STATUS
EFIAPI
EbcDebugRegisterPeriodicCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_PERIODIC_CALLBACK PeriodicCallback
);
/**
This protocol service is called by the debug agent to register a function
for us to call when we detect an exception.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param ProcessorIndex Specifies which processor the callback function
applies to.
@param ExceptionCallback A pointer to a function of type
EXCEPTION_CALLBACK that is called when the
processor exception specified by ExceptionType
occurs. Passing NULL unregisters any previously
registered function associated with
ExceptionType.
@param ExceptionType Specifies which processor exception to hook.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ALREADY_STARTED Non-NULL ExceptionCallback parameter when a
callback function was previously registered.
@retval EFI_INVALID_PARAMETER ExceptionType parameter is negative or exceeds
MAX_EBC_EXCEPTION.
@retval EFI_INVALID_PARAMETER Null ExceptionCallback parameter when no
callback function was previously registered.
**/
EFI_STATUS
EFIAPI
EbcDebugRegisterExceptionCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_EXCEPTION_CALLBACK ExceptionCallback,
IN EFI_EXCEPTION_TYPE ExceptionType
);
/**
This EBC debugger protocol service is called by the debug agent. Required
for DebugSupport compliance but is only stubbed out for EBC.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param ProcessorIndex Specifies which processor the callback function
applies to.
@param Start StartSpecifies the physical base of the memory
range to be invalidated.
@param Length Specifies the minimum number of bytes in the
processor's instruction cache to invalidate.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcDebugInvalidateInstructionCache (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN VOID *Start,
IN UINT64 Length
);
//
// We have one linked list of image handles for the whole world. Since
// there should only be one interpreter, make them global. They must
// also be global since the execution of an EBC image does not provide
// a This pointer.
//
EBC_IMAGE_LIST *mEbcImageList = NULL;
//
// Callback function to flush the icache after thunk creation
//
EBC_ICACHE_FLUSH mEbcICacheFlush;
//
// These get set via calls by the debug agent
//
EFI_PERIODIC_CALLBACK mDebugPeriodicCallback = NULL;
EFI_EXCEPTION_CALLBACK mDebugExceptionCallback[MAX_EBC_EXCEPTION + 1] = {NULL};
VOID *mStackBuffer[MAX_STACK_NUM];
EFI_HANDLE mStackBufferIndex[MAX_STACK_NUM];
UINTN mStackNum = 0;
//
// Event for Periodic callback
//
EFI_EVENT mEbcPeriodicEvent;
VM_CONTEXT *mVmPtr = NULL;
/**
Initializes the VM EFI interface. Allocates memory for the VM interface
and registers the VM protocol.
@param ImageHandle EFI image handle.
@param SystemTable Pointer to the EFI system table.
@return Standard EFI status code.
**/
EFI_STATUS
EFIAPI
InitializeEbcDriver (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_EBC_PROTOCOL *EbcProtocol;
EFI_EBC_PROTOCOL *OldEbcProtocol;
EFI_STATUS Status;
EFI_DEBUG_SUPPORT_PROTOCOL *EbcDebugProtocol;
EFI_HANDLE *HandleBuffer;
UINTN NumHandles;
UINTN Index;
BOOLEAN Installed;
EbcProtocol = NULL;
EbcDebugProtocol = NULL;
//
// Allocate memory for our protocol. Then fill in the blanks.
//
EbcProtocol = AllocatePool (sizeof (EFI_EBC_PROTOCOL));
if (EbcProtocol == NULL) {
return EFI_OUT_OF_RESOURCES;
}
EbcProtocol->CreateThunk = EbcCreateThunk;
EbcProtocol->UnloadImage = EbcUnloadImage;
EbcProtocol->RegisterICacheFlush = EbcRegisterICacheFlush;
EbcProtocol->GetVersion = EbcGetVersion;
mEbcICacheFlush = NULL;
//
// Find any already-installed EBC protocols and uninstall them
//
Installed = FALSE;
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiEbcProtocolGuid,
NULL,
&NumHandles,
&HandleBuffer
);
if (Status == EFI_SUCCESS) {
//
// Loop through the handles
//
for (Index = 0; Index < NumHandles; Index++) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
(VOID **) &OldEbcProtocol
);
if (Status == EFI_SUCCESS) {
if (gBS->ReinstallProtocolInterface (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
OldEbcProtocol,
EbcProtocol
) == EFI_SUCCESS) {
Installed = TRUE;
}
}
}
}
if (HandleBuffer != NULL) {
FreePool (HandleBuffer);
HandleBuffer = NULL;
}
//
// Add the protocol so someone can locate us if we haven't already.
//
if (!Installed) {
Status = gBS->InstallProtocolInterface (
&ImageHandle,
&gEfiEbcProtocolGuid,
EFI_NATIVE_INTERFACE,
EbcProtocol
);
if (EFI_ERROR (Status)) {
FreePool (EbcProtocol);
return Status;
}
}
Status = InitEBCStack();
if (EFI_ERROR(Status)) {
goto ErrorExit;
}
//
// Allocate memory for our debug protocol. Then fill in the blanks.
//
EbcDebugProtocol = AllocatePool (sizeof (EFI_DEBUG_SUPPORT_PROTOCOL));
if (EbcDebugProtocol == NULL) {
goto ErrorExit;
}
EbcDebugProtocol->Isa = IsaEbc;
EbcDebugProtocol->GetMaximumProcessorIndex = EbcDebugGetMaximumProcessorIndex;
EbcDebugProtocol->RegisterPeriodicCallback = EbcDebugRegisterPeriodicCallback;
EbcDebugProtocol->RegisterExceptionCallback = EbcDebugRegisterExceptionCallback;
EbcDebugProtocol->InvalidateInstructionCache = EbcDebugInvalidateInstructionCache;
//
// Add the protocol so the debug agent can find us
//
Status = gBS->InstallProtocolInterface (
&ImageHandle,
&gEfiDebugSupportProtocolGuid,
EFI_NATIVE_INTERFACE,
EbcDebugProtocol
);
//
// This is recoverable, so free the memory and continue.
//
if (EFI_ERROR (Status)) {
FreePool (EbcDebugProtocol);
goto ErrorExit;
}
//
// Install EbcDebugSupport Protocol Successfully
// Now we need to initialize the Ebc default Callback
//
Status = InitializeEbcCallback (EbcDebugProtocol);
//
// Produce a VM test interface protocol. Not required for execution.
//
DEBUG_CODE_BEGIN ();
InitEbcVmTestProtocol (&ImageHandle);
DEBUG_CODE_END ();
EbcDebuggerHookInit (ImageHandle, EbcDebugProtocol);
return EFI_SUCCESS;
ErrorExit:
FreeEBCStack();
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiEbcProtocolGuid,
NULL,
&NumHandles,
&HandleBuffer
);
if (Status == EFI_SUCCESS) {
//
// Loop through the handles
//
for (Index = 0; Index < NumHandles; Index++) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
(VOID **) &OldEbcProtocol
);
if (Status == EFI_SUCCESS) {
gBS->UninstallProtocolInterface (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
OldEbcProtocol
);
}
}
}
if (HandleBuffer != NULL) {
FreePool (HandleBuffer);
HandleBuffer = NULL;
}
FreePool (EbcProtocol);
return Status;
}
/**
This is the top-level routine plugged into the EBC protocol. Since thunks
are very processor-specific, from here we dispatch directly to the very
processor-specific routine EbcCreateThunks().
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param ImageHandle Handle of image for which the thunk is being
created. The EBC interpreter may use this to
keep track of any resource allocations
performed in loading and executing the image.
@param EbcEntryPoint Address of the actual EBC entry point or
protocol service the thunk should call.
@param Thunk Returned pointer to a thunk created.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Image entry point is not 2-byte aligned.
@retval EFI_OUT_OF_RESOURCES Memory could not be allocated for the thunk.
**/
EFI_STATUS
EFIAPI
EbcCreateThunk (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle,
IN VOID *EbcEntryPoint,
OUT VOID **Thunk
)
{
EFI_STATUS Status;
Status = EbcCreateThunks (
ImageHandle,
EbcEntryPoint,
Thunk,
FLAG_THUNK_ENTRY_POINT
);
return Status;
}
/**
This EBC debugger protocol service is called by the debug agent
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param MaxProcessorIndex Pointer to a caller-allocated UINTN in which the
maximum supported processor index is returned.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcDebugGetMaximumProcessorIndex (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
OUT UINTN *MaxProcessorIndex
)
{
*MaxProcessorIndex = 0;
return EFI_SUCCESS;
}
/**
This protocol service is called by the debug agent to register a function
for us to call on a periodic basis.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param ProcessorIndex Specifies which processor the callback function
applies to.
@param PeriodicCallback A pointer to a function of type
PERIODIC_CALLBACK that is the main periodic
entry point of the debug agent. It receives as a
parameter a pointer to the full context of the
interrupted execution thread.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ALREADY_STARTED Non-NULL PeriodicCallback parameter when a
callback function was previously registered.
@retval EFI_INVALID_PARAMETER Null PeriodicCallback parameter when no
callback function was previously registered.
**/
EFI_STATUS
EFIAPI
EbcDebugRegisterPeriodicCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_PERIODIC_CALLBACK PeriodicCallback
)
{
if ((mDebugPeriodicCallback == NULL) && (PeriodicCallback == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((mDebugPeriodicCallback != NULL) && (PeriodicCallback != NULL)) {
return EFI_ALREADY_STARTED;
}
mDebugPeriodicCallback = PeriodicCallback;
return EFI_SUCCESS;
}
/**
This protocol service is called by the debug agent to register a function
for us to call when we detect an exception.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param ProcessorIndex Specifies which processor the callback function
applies to.
@param ExceptionCallback A pointer to a function of type
EXCEPTION_CALLBACK that is called when the
processor exception specified by ExceptionType
occurs. Passing NULL unregisters any previously
registered function associated with
ExceptionType.
@param ExceptionType Specifies which processor exception to hook.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ALREADY_STARTED Non-NULL ExceptionCallback parameter when a
callback function was previously registered.
@retval EFI_INVALID_PARAMETER ExceptionType parameter is negative or exceeds
MAX_EBC_EXCEPTION.
@retval EFI_INVALID_PARAMETER Null ExceptionCallback parameter when no
callback function was previously registered.
**/
EFI_STATUS
EFIAPI
EbcDebugRegisterExceptionCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_EXCEPTION_CALLBACK ExceptionCallback,
IN EFI_EXCEPTION_TYPE ExceptionType
)
{
if ((ExceptionType < 0) || (ExceptionType > MAX_EBC_EXCEPTION)) {
return EFI_INVALID_PARAMETER;
}
if ((mDebugExceptionCallback[ExceptionType] == NULL) && (ExceptionCallback == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((mDebugExceptionCallback[ExceptionType] != NULL) && (ExceptionCallback != NULL)) {
return EFI_ALREADY_STARTED;
}
mDebugExceptionCallback[ExceptionType] = ExceptionCallback;
return EFI_SUCCESS;
}
/**
This EBC debugger protocol service is called by the debug agent. Required
for DebugSupport compliance but is only stubbed out for EBC.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@param ProcessorIndex Specifies which processor the callback function
applies to.
@param Start StartSpecifies the physical base of the memory
range to be invalidated.
@param Length Specifies the minimum number of bytes in the
processor's instruction cache to invalidate.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcDebugInvalidateInstructionCache (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN VOID *Start,
IN UINT64 Length
)
{
return EFI_SUCCESS;
}
/**
The VM interpreter calls this function when an exception is detected.
@param ExceptionType Specifies the processor exception detected.
@param ExceptionFlags Specifies the exception context.
@param VmPtr Pointer to a VM context for passing info to the
EFI debugger.
@retval EFI_SUCCESS This function completed successfully.
**/
EFI_STATUS
EbcDebugSignalException (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN EXCEPTION_FLAGS ExceptionFlags,
IN VM_CONTEXT *VmPtr
)
{
EFI_SYSTEM_CONTEXT_EBC EbcContext;
EFI_SYSTEM_CONTEXT SystemContext;
ASSERT ((ExceptionType >= 0) && (ExceptionType <= MAX_EBC_EXCEPTION));
//
// Save the exception in the context passed in
//
VmPtr->ExceptionFlags |= ExceptionFlags;
VmPtr->LastException = (UINTN) ExceptionType;
//
// If it's a fatal exception, then flag it in the VM context in case an
// attached debugger tries to return from it.
//
if ((ExceptionFlags & EXCEPTION_FLAG_FATAL) != 0) {
VmPtr->StopFlags |= STOPFLAG_APP_DONE;
}
//
// If someone's registered for exception callbacks, then call them.
//
// EBC driver will register default exception callback to report the
// status code via the status code API
//
if (mDebugExceptionCallback[ExceptionType] != NULL) {
//
// Initialize the context structure
//
EbcContext.R0 = (UINT64) VmPtr->Gpr[0];
EbcContext.R1 = (UINT64) VmPtr->Gpr[1];
EbcContext.R2 = (UINT64) VmPtr->Gpr[2];
EbcContext.R3 = (UINT64) VmPtr->Gpr[3];
EbcContext.R4 = (UINT64) VmPtr->Gpr[4];
EbcContext.R5 = (UINT64) VmPtr->Gpr[5];
EbcContext.R6 = (UINT64) VmPtr->Gpr[6];
EbcContext.R7 = (UINT64) VmPtr->Gpr[7];
EbcContext.Ip = (UINT64)(UINTN)VmPtr->Ip;
EbcContext.Flags = VmPtr->Flags;
EbcContext.ControlFlags = 0;
SystemContext.SystemContextEbc = &EbcContext;
mDebugExceptionCallback[ExceptionType] (ExceptionType, SystemContext);
//
// Restore the context structure and continue to execute
//
VmPtr->Gpr[0] = EbcContext.R0;
VmPtr->Gpr[1] = EbcContext.R1;
VmPtr->Gpr[2] = EbcContext.R2;
VmPtr->Gpr[3] = EbcContext.R3;
VmPtr->Gpr[4] = EbcContext.R4;
VmPtr->Gpr[5] = EbcContext.R5;
VmPtr->Gpr[6] = EbcContext.R6;
VmPtr->Gpr[7] = EbcContext.R7;
VmPtr->Ip = (VMIP)(UINTN)EbcContext.Ip;
VmPtr->Flags = EbcContext.Flags;
}
return EFI_SUCCESS;
}
/**
To install default Callback function for the VM interpreter.
@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL
instance.
@retval EFI_SUCCESS The function completed successfully.
@retval Others Some error occurs when creating periodic event.
**/
EFI_STATUS
EFIAPI
InitializeEbcCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This
)
{
INTN Index;
EFI_STATUS Status;
//
// For ExceptionCallback
//
for (Index = 0; Index <= MAX_EBC_EXCEPTION; Index++) {
EbcDebugRegisterExceptionCallback (
This,
0,
CommonEbcExceptionHandler,
Index
);
}
//
// For PeriodicCallback
//
Status = gBS->CreateEvent (
EVT_TIMER | EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
EbcPeriodicNotifyFunction,
&mVmPtr,
&mEbcPeriodicEvent
);
if (EFI_ERROR(Status)) {
return Status;
}
Status = gBS->SetTimer (
mEbcPeriodicEvent,
TimerPeriodic,
EBC_VM_PERIODIC_CALLBACK_RATE
);
if (EFI_ERROR(Status)) {
return Status;
}
return EFI_SUCCESS;
}
/**
The default Exception Callback for the VM interpreter.
In this function, we report status code, and print debug information
about EBC_CONTEXT, then dead loop.
@param InterruptType Interrupt type.
@param SystemContext EBC system context.
**/
VOID
EFIAPI
CommonEbcExceptionHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_SYSTEM_CONTEXT SystemContext
)
{
//
// We print debug information to let user know what happen.
//
DEBUG ((
EFI_D_ERROR,
"EBC Interrupter Version - 0x%016lx\n",
(UINT64) (((VM_MAJOR_VERSION & 0xFFFF) << 16) | ((VM_MINOR_VERSION & 0xFFFF)))
));
DEBUG ((
EFI_D_ERROR,
"Exception Type - 0x%016lx\n",
(UINT64)(UINTN)InterruptType
));
DEBUG ((
EFI_D_ERROR,
" R0 - 0x%016lx, R1 - 0x%016lx\n",
SystemContext.SystemContextEbc->R0,
SystemContext.SystemContextEbc->R1
));
DEBUG ((
EFI_D_ERROR,
" R2 - 0x%016lx, R3 - 0x%016lx\n",
SystemContext.SystemContextEbc->R2,
SystemContext.SystemContextEbc->R3
));
DEBUG ((
EFI_D_ERROR,
" R4 - 0x%016lx, R5 - 0x%016lx\n",
SystemContext.SystemContextEbc->R4,
SystemContext.SystemContextEbc->R5
));
DEBUG ((
EFI_D_ERROR,
" R6 - 0x%016lx, R7 - 0x%016lx\n",
SystemContext.SystemContextEbc->R6,
SystemContext.SystemContextEbc->R7
));
DEBUG ((
EFI_D_ERROR,
" Flags - 0x%016lx\n",
SystemContext.SystemContextEbc->Flags
));
DEBUG ((
EFI_D_ERROR,
" ControlFlags - 0x%016lx\n",
SystemContext.SystemContextEbc->ControlFlags
));
DEBUG ((
EFI_D_ERROR,
" Ip - 0x%016lx\n\n",
SystemContext.SystemContextEbc->Ip
));
//
// We deadloop here to make it easy to debug this issue.
//
CpuDeadLoop ();
return ;
}
/**
The periodic callback function for EBC VM interpreter, which is used
to support the EFI debug support protocol.
@param Event The Periodic Callback Event.
@param Context It should be the address of VM_CONTEXT pointer.
**/
VOID
EFIAPI
EbcPeriodicNotifyFunction (
IN EFI_EVENT Event,
IN VOID *Context
)
{
VM_CONTEXT *VmPtr;
VmPtr = *(VM_CONTEXT **)Context;
if (VmPtr != NULL) {
EbcDebugPeriodic (VmPtr);
}
return ;
}
/**
The VM interpreter calls this function on a periodic basis to support
the EFI debug support protocol.
@param VmPtr Pointer to a VM context for passing info to the
debugger.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcDebugPeriodic (
IN VM_CONTEXT *VmPtr
)
{
EFI_SYSTEM_CONTEXT_EBC EbcContext;
EFI_SYSTEM_CONTEXT SystemContext;
//
// If someone's registered for periodic callbacks, then call them.
//
if (mDebugPeriodicCallback != NULL) {
//
// Initialize the context structure
//
EbcContext.R0 = (UINT64) VmPtr->Gpr[0];
EbcContext.R1 = (UINT64) VmPtr->Gpr[1];
EbcContext.R2 = (UINT64) VmPtr->Gpr[2];
EbcContext.R3 = (UINT64) VmPtr->Gpr[3];
EbcContext.R4 = (UINT64) VmPtr->Gpr[4];
EbcContext.R5 = (UINT64) VmPtr->Gpr[5];
EbcContext.R6 = (UINT64) VmPtr->Gpr[6];
EbcContext.R7 = (UINT64) VmPtr->Gpr[7];
EbcContext.Ip = (UINT64)(UINTN)VmPtr->Ip;
EbcContext.Flags = VmPtr->Flags;
EbcContext.ControlFlags = 0;
SystemContext.SystemContextEbc = &EbcContext;
mDebugPeriodicCallback (SystemContext);
//
// Restore the context structure and continue to execute
//
VmPtr->Gpr[0] = EbcContext.R0;
VmPtr->Gpr[1] = EbcContext.R1;
VmPtr->Gpr[2] = EbcContext.R2;
VmPtr->Gpr[3] = EbcContext.R3;
VmPtr->Gpr[4] = EbcContext.R4;
VmPtr->Gpr[5] = EbcContext.R5;
VmPtr->Gpr[6] = EbcContext.R6;
VmPtr->Gpr[7] = EbcContext.R7;
VmPtr->Ip = (VMIP)(UINTN)EbcContext.Ip;
VmPtr->Flags = EbcContext.Flags;
}
return EFI_SUCCESS;
}
/**
This routine is called by the core when an image is being unloaded from
memory. Basically we now have the opportunity to do any necessary cleanup.
Typically this will include freeing any memory allocated for thunk-creation.
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param ImageHandle Handle of image for which the thunk is being
created.
@retval EFI_INVALID_PARAMETER The ImageHandle passed in was not found in the
internal list of EBC image handles.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcUnloadImage (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle
)
{
EBC_THUNK_LIST *ThunkList;
EBC_THUNK_LIST *NextThunkList;
EBC_IMAGE_LIST *ImageList;
EBC_IMAGE_LIST *PrevImageList;
//
// First go through our list of known image handles and see if we've already
// created an image list element for this image handle.
//
ReturnEBCStackByHandle(ImageHandle);
PrevImageList = NULL;
for (ImageList = mEbcImageList; ImageList != NULL; ImageList = ImageList->Next) {
if (ImageList->ImageHandle == ImageHandle) {
break;
}
//
// Save the previous so we can connect the lists when we remove this one
//
PrevImageList = ImageList;
}
if (ImageList == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Free up all the thunk buffers and thunks list elements for this image
// handle.
//
ThunkList = ImageList->ThunkList;
while (ThunkList != NULL) {
NextThunkList = ThunkList->Next;
FreePool (ThunkList->ThunkBuffer);
FreePool (ThunkList);
ThunkList = NextThunkList;
}
//
// Now remove this image list element from the chain
//
if (PrevImageList == NULL) {
//
// Remove from head
//
mEbcImageList = ImageList->Next;
} else {
PrevImageList->Next = ImageList->Next;
}
//
// Now free up the image list element
//
FreePool (ImageList);
EbcDebuggerHookEbcUnloadImage (ImageHandle);
return EFI_SUCCESS;
}
/**
Add a thunk to our list of thunks for a given image handle.
Also flush the instruction cache since we've written thunk code
to memory that will be executed eventually.
@param ImageHandle The image handle to which the thunk is tied.
@param ThunkBuffer The buffer that has been created/allocated.
@param ThunkSize The size of the thunk memory allocated.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EbcAddImageThunk (
IN EFI_HANDLE ImageHandle,
IN VOID *ThunkBuffer,
IN UINT32 ThunkSize
)
{
EBC_THUNK_LIST *ThunkList;
EBC_IMAGE_LIST *ImageList;
EFI_STATUS Status;
//
// It so far so good, then flush the instruction cache
//
if (mEbcICacheFlush != NULL) {
Status = mEbcICacheFlush ((EFI_PHYSICAL_ADDRESS) (UINTN) ThunkBuffer, ThunkSize);
if (EFI_ERROR (Status)) {
return Status;
}
}
//
// Go through our list of known image handles and see if we've already
// created a image list element for this image handle.
//
for (ImageList = mEbcImageList; ImageList != NULL; ImageList = ImageList->Next) {
if (ImageList->ImageHandle == ImageHandle) {
break;
}
}
if (ImageList == NULL) {
//
// Allocate a new one
//
ImageList = AllocatePool (sizeof (EBC_IMAGE_LIST));
if (ImageList == NULL) {
return EFI_OUT_OF_RESOURCES;
}
ImageList->ThunkList = NULL;
ImageList->ImageHandle = ImageHandle;
ImageList->Next = mEbcImageList;
mEbcImageList = ImageList;
}
//
// Ok, now create a new thunk element to add to the list
//
ThunkList = AllocatePool (sizeof (EBC_THUNK_LIST));
if (ThunkList == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Add it to the head of the list
//
ThunkList->Next = ImageList->ThunkList;
ThunkList->ThunkBuffer = ThunkBuffer;
ImageList->ThunkList = ThunkList;
return EFI_SUCCESS;
}
/**
Registers a callback function that the EBC interpreter calls to flush the
processor instruction cache following creation of thunks.
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param Flush Pointer to a function of type EBC_ICACH_FLUSH.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
EbcRegisterICacheFlush (
IN EFI_EBC_PROTOCOL *This,
IN EBC_ICACHE_FLUSH Flush
)
{
mEbcICacheFlush = Flush;
return EFI_SUCCESS;
}
/**
Called to get the version of the interpreter.
@param This A pointer to the EFI_EBC_PROTOCOL instance.
@param Version Pointer to where to store the returned version
of the interpreter.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Version pointer is NULL.
**/
EFI_STATUS
EFIAPI
EbcGetVersion (
IN EFI_EBC_PROTOCOL *This,
IN OUT UINT64 *Version
)
{
if (Version == NULL) {
return EFI_INVALID_PARAMETER;
}
*Version = GetVmVersion ();
return EFI_SUCCESS;
}
/**
Returns the stack index and buffer assosicated with the Handle parameter.
@param Handle The EFI handle as the index to the EBC stack.
@param StackBuffer A pointer to hold the returned stack buffer.
@param BufferIndex A pointer to hold the returned stack index.
@retval EFI_OUT_OF_RESOURCES The Handle parameter does not correspond to any
existing EBC stack.
@retval EFI_SUCCESS The stack index and buffer were found and
returned to the caller.
**/
EFI_STATUS
GetEBCStack(
IN EFI_HANDLE Handle,
OUT VOID **StackBuffer,
OUT UINTN *BufferIndex
)
{
UINTN Index;
EFI_TPL OldTpl;
OldTpl = gBS->RaiseTPL(TPL_HIGH_LEVEL);
for (Index = 0; Index < mStackNum; Index ++) {
if (mStackBufferIndex[Index] == NULL) {
mStackBufferIndex[Index] = Handle;
break;
}
}
gBS->RestoreTPL(OldTpl);
if (Index == mStackNum) {
return EFI_OUT_OF_RESOURCES;
}
*BufferIndex = Index;
*StackBuffer = mStackBuffer[Index];
return EFI_SUCCESS;
}
/**
Returns from the EBC stack by stack Index.
@param Index Specifies which EBC stack to return from.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
ReturnEBCStack(
IN UINTN Index
)
{
mStackBufferIndex[Index] = NULL;
return EFI_SUCCESS;
}
/**
Returns from the EBC stack associated with the Handle parameter.
@param Handle Specifies the EFI handle to find the EBC stack with.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
ReturnEBCStackByHandle(
IN EFI_HANDLE Handle
)
{
UINTN Index;
for (Index = 0; Index < mStackNum; Index ++) {
if (mStackBufferIndex[Index] == Handle) {
break;
}
}
if (Index == mStackNum) {
return EFI_NOT_FOUND;
}
mStackBufferIndex[Index] = NULL;
return EFI_SUCCESS;
}
/**
Allocates memory to hold all the EBC stacks.
@retval EFI_SUCCESS The EBC stacks were allocated successfully.
@retval EFI_OUT_OF_RESOURCES Not enough memory available for EBC stacks.
**/
EFI_STATUS
InitEBCStack (
VOID
)
{
for (mStackNum = 0; mStackNum < MAX_STACK_NUM; mStackNum ++) {
mStackBuffer[mStackNum] = AllocatePool(STACK_POOL_SIZE);
mStackBufferIndex[mStackNum] = NULL;
if (mStackBuffer[mStackNum] == NULL) {
break;
}
}
if (mStackNum == 0) {
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}
/**
Free all EBC stacks allocated before.
@retval EFI_SUCCESS All the EBC stacks were freed.
**/
EFI_STATUS
FreeEBCStack(
VOID
)
{
UINTN Index;
for (Index = 0; Index < mStackNum; Index ++) {
FreePool(mStackBuffer[Index]);
}
return EFI_SUCCESS;
}
/**
Produces an EBC VM test protocol that can be used for regression tests.
@param IHandle Handle on which to install the protocol.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
InitEbcVmTestProtocol (
IN EFI_HANDLE *IHandle
)
{
EFI_HANDLE Handle;
EFI_STATUS Status;
EFI_EBC_VM_TEST_PROTOCOL *EbcVmTestProtocol;
//
// Allocate memory for the protocol, then fill in the fields
//
EbcVmTestProtocol = AllocatePool (sizeof (EFI_EBC_VM_TEST_PROTOCOL));
if (EbcVmTestProtocol == NULL) {
return EFI_OUT_OF_RESOURCES;
}
EbcVmTestProtocol->Execute = (EBC_VM_TEST_EXECUTE) EbcExecuteInstructions;
DEBUG_CODE_BEGIN ();
EbcVmTestProtocol->Assemble = (EBC_VM_TEST_ASM) EbcVmTestUnsupported;
EbcVmTestProtocol->Disassemble = (EBC_VM_TEST_DASM) EbcVmTestUnsupported;
DEBUG_CODE_END ();
//
// Publish the protocol
//
Handle = NULL;
Status = gBS->InstallProtocolInterface (&Handle, &gEfiEbcVmTestProtocolGuid, EFI_NATIVE_INTERFACE, EbcVmTestProtocol);
if (EFI_ERROR (Status)) {
FreePool (EbcVmTestProtocol);
}
return Status;
}
/**
Returns the EFI_UNSUPPORTED Status.
@return EFI_UNSUPPORTED This function always return EFI_UNSUPPORTED status.
**/
EFI_STATUS
EFIAPI
EbcVmTestUnsupported (
VOID
)
{
return EFI_UNSUPPORTED;
}
/**
Allocates a buffer of type EfiBootServicesCode.
@param AllocationSize The number of bytes to allocate.
@return A pointer to the allocated buffer or NULL if allocation fails.
**/
VOID *
EFIAPI
EbcAllocatePoolForThunk (
IN UINTN AllocationSize
)
{
VOID *Buffer;
EFI_STATUS Status;
Status = gBS->AllocatePool (EfiBootServicesCode, AllocationSize, &Buffer);
if (EFI_ERROR (Status)) {
return NULL;
}
return Buffer;
}
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